Unlikely. Dropping it into GIMP, Just the straight highway section in the middle is only 509 x 12 pixels. Assume 1 car per pixel (at least since individual cars are visible), and that's still only 6,108.

And that's assuming that cars are literally covering every square inch of highway. Rough ballpark, I think it'd cap out at about 10,000 cars, which given this is Texas, would account for around 10,100 people.